Machine for the production of powdered fuel



Feb. 20,1923, y

l c. 5. BLYTH'. MACHINE FOR THE` PRODUCTION 0F POWDERED FUEL.

2 SHEETS SHEET 1.

-HLED APR. 18, 19241.v

Patented Feb. 20, 1923. i i,

i CHAI-BEES EDWARD BLYTH, F DUNCHU RUGABY, ENG- LAND MACHINE FOR THE PRODUCTIQN OF POWDERED IIIFIJ'IEILv i Application led April 18, 1921. Serial No. 462,270.1

To all 'whom it may concer/n.' u l rBe it known that I, CHARLES EDWARD BLYTH, a subject of the King of Great Britain, residing at Dunchurch, Near Rugby,

' in tha-county of Warwick, England, have in .vented new and usefuhlmprovements in Machines for the Pro-duction of vPowdered Fuel, of which the following ,is a specification.

This invention relates to. pulverizing machines of the kind comprising a casing which is divided into rst'and second chambers by means of a 'disc mounted rotatably therein and carrying impellers or beaters on each face.

The object ofthe present invention is to' `improve the efficiency of such machines more especially vwhen vintended for use in the production of powdered fuel.

In a machine constructed according to this invention the first and second chambers have internal communication with each other and a space is provided between the free ends of the impellers on the disc and the interior surface of the casing to allow for free circulation of the suspended maiy terial prior to its delivery from the second 4 chamber through any orifice 'centrally arrangedI with respect to the discj- In order tha-tithe invention may be clearly understood and readily carried into practical effect reference is made in further describing the same' tov AKthe accompanying l the disc a and to an eXtendingllange on the drawing, in which Figure 1 is a longitudinal sectional view of one form of machine for carrying out- Figure 7 is a perspective lview on a larger scale of one of the fan blades .or deliectors.

Referring to the drawing,l the beater disc a of which theremay be one only, as shown, is rotatably mounted in a fixedy casing Z) through which the driving shaft c passes.

Pafrlsuro FICE.

d which pass between lixed beaters e on the inside walls of the casing. Between the free ends of the impellers d and the inside walls of the casing a. space which, `as sheWn, is more than suflicient for clearance, is leftto allow for free circulation of the suspended material. I

The intake side of the beater disc pro-` vided at its periphery with an annular series of closely arranged transversely curved fan blades f having flanged ends as seen in Figure 7 whereby. they are riveted at one end to the disc a and at the other endto an annular plate g1 The object of these blades, the arrangement of which is clearly shewn in Figure, 'is to keep the material under treatment against the action of. centrifugal force set up by the rotating disc a, within the area swept by the beaters until it has been reduced to such ineness that, the `effeet of centrifugal forcel on being' negligible,

u each particle 1t will pass with the air' current between the blades f and be univ formly distributedthereby 'around the discv a into the second or delivery chamber at y the other side of the said disc.

On the other or delivery` side of the beater disc and surrounding the ,hub of the same is a smaller ring of curved bladesh which are arranged parallel with the axis of the machine and riveted by Atheir flangedends to to preclude the possibility of any coarse pjar-A Y ticles that may have fo'und'their way into the il second or delivery chamber passing through the delivery orifice and to return fsuch particles back amongstI the beaters until reduced to the requisite degree of fineness that they will pass with the air current between the blades L.

The fuel, previously reduced to-about the into one end of the machineV from a hopper z' by means of a feed ,screw 1 whence it falls' amongst and is rapidly reduced bythe beatvers .to a fine powder. At or about the same end of the machine anv opening Z which may be adjustable isprovided for the entrance of hot air the temperature and pressure of which may be varied. The heat of the waste gases fron1` the furnace may be conveniently .size of one inch lcubes, is fed'continuously.

partment toward the centralA delivery Iori-.

lice. f

It is found that with this machine the ineness of the'powdered product-@aube va-v ried at will by suitably regulating the velocity of exit,A as by introducing more or less air direct into the' casing of the fan m. If. this terminal velocity of the material is reduced below the internal maximum velocity produced by the disc a, internal circulation v is set up, the material delivered atJshe edge of'the disc returning by way of the space provided for the purpose as shewnvin the drawiii'g between the free ends of the impellers d and the adjacent walls of the casing toward the low pressure zones at' the Centre of.' the disc whence it is' again impelled toward theedge of Jthe disc. This takes place to a more or less extent at both n sides of the disc so that by the time the `material reaches the delivery orilice it is more 'linely divided than where the path of the material through rthe machine is comparatively direct, as happens .when the terminal velocity of the material equals or exceeds its maximum` internal velocity.

1.- A xpulverizing device comprising' a stasaid disk and-forminga con uit from tionary casing havinga vfeeding and dis- I charge opening on opposite sides, a disk rotatably mounted in said casing between said openings and havingl impellers on its opposite sides, beaters secured on theside walls' of said casing intermeshing .with said 4disk` inipellers, fan blades secured to the inlet/'side of said disc-adjacent its rim, and. blades secured to said disc on the opposite side thereof from said fan blades forming 'a conduit for the fines.

2. A pulverizing device comprising a Stationary casing having a feeding and discharge opening on opposite sides, a disk rotatably mounted in said easing between said openings, impellers projecting -fom opposite sides ofsaid disk witha space more than sufficient for clearance 'between their free endslandtheside walls of said casing, beat! communicating with said discharge opening and blades secured to/the ad'acent side of said Casin to said fan chamber.

3.` pulverizin'g device comprising a stationary casing having a feedii 1g anddischarge opening on opposite sides, adisc rotatably mounted in said casing between and (1o-axially with said openings andhaving impellens projecting from itsopposite sides with a space more than sufficient for clear-v ance between the free endsrof said impellers and the inside walls of saidcasing, beaters projecting from the' insidel walls of said casing, a` fan chamber and meanspassing through said discharge opening for establishing communication between Said fan chamber and said casing and for preventing coarse material leavin thevlatter.`

'CHARLES E WARD BLYTH.v 

